Alert archive / Montana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Glasgow, MT

June 4, 2021Dawson County, Garfield County, McCone County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 4, 2021, 8:54 PM MDT for Dawson County, Garfield County, McCone County, Montana. It was in force for 66 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jun 4, 2021, 8:54 PM MDT (02:54 UTC)
Expired
Jun 4, 2021, 10:00 PM MDT
In force
66 min
Issued by
NWS Glasgow, MT
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Dawson County, MT, Garfield County, MT, McCone County, MT

The radar

The Glasgow radar (KGGW), 75 km from the middle of the area, began a volume at 02:57 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jun 4, 8:54 PM MDTTSTM WND GST 6011 Nne Nelson Creek Rec, MTWIND LASTED ABOUT 10 MINUTES WITH HEAVY RAIN.
Jun 4, 9:08 PM MDTTSTM WND GST 657 N Weldon, MTESTIMATED 60-65 MPH. POWER IS OUT.
Jun 4, 9:48 PM MDTTSTM WND GST 5510 S Vida, MTMESONET STATION MTCOW 9.9 S VIDA (MT DOT).

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 4, 4:01 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.9 hours before the alert went out and 75 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 00:00Z on 2021-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 291 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 00:00Z on 2021-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
291 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
3180 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted.

608 
WUUS55 KGGW 050254
SVRGGW
MTC021-033-055-050400-
/O.NEW.KGGW.SV.W.0002.210605T0254Z-210605T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Glasgow MT
854 PM MDT Fri Jun 4 2021

The National Weather Service in Glasgow has issued a

* Severe Thunderstorm Warning for...
  Northeastern Garfield County in northeastern Montana...
  Central McCone County in northeastern Montana...
  Northwestern Dawson County in northeastern Montana...

* Until 1000 PM MDT.

* At 854 PM MDT, a severe thunderstorm was located 8 miles northeast
  of Rock Creek Rec Area, or 29 miles southwest of Wolf Point, moving
  southeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Rock Creek Rec Area and Weldon. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4771 10632 4796 10601 4778 10534 4738 10570
TIME...MOT...LOC 0254Z 299DEG 22KT 4779 10609 

HAIL...<.75IN
WIND...60MPH
 
$$

GAH @ NWS Glasgow
2 follow-up statements
575 
WWUS55 KGGW 050314
SVSGGW

Severe Weather Statement
National Weather Service Glasgow MT
914 PM MDT Fri Jun 4 2021

MTC021-033-055-050400-
/O.CON.KGGW.SV.W.0002.000000T0000Z-210605T0400Z/
Garfield MT-McCone MT-Dawson MT-
914 PM MDT Fri Jun 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM MDT
FOR NORTHEASTERN GARFIELD...CENTRAL MCCONE AND NORTHWESTERN DAWSON
COUNTIES...

At 913 PM MDT, a severe thunderstorm was located 14 miles east of
Rock Creek Rec Area, or 27 miles northwest of Circle, moving
southeast at 25 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Rock Creek Rec Area and Weldon. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4771 10632 4796 10601 4778 10534 4738 10570
TIME...MOT...LOC 0313Z 299DEG 22KT 4773 10594 

HAIL...0.88IN
WIND...70MPH
 
$$

NWS Glasgow / GAH
248 
WWUS55 KGGW 050325
SVSGGW

Severe Weather Statement
National Weather Service Glasgow MT
925 PM MDT Fri Jun 4 2021

MTC033-050334-
/O.CAN.KGGW.SV.W.0002.000000T0000Z-210605T0400Z/
Garfield MT-
925 PM MDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GARFIELD COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
northeastern Montana.

LAT...LON 4755 10600 4776 10602 4790 10578 4778 10534
      4738 10570
TIME...MOT...LOC 0324Z 299DEG 22KT 4770 10585 

$$

MTC021-055-050400-
/O.CON.KGGW.SV.W.0002.000000T0000Z-210605T0400Z/
McCone MT-Dawson MT-
925 PM MDT Fri Jun 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM MDT
FOR CENTRAL MCCONE AND NORTHWESTERN DAWSON COUNTIES...

At 924 PM MDT, a severe thunderstorm was located 18 miles southwest
of Vida, or 22 miles northwest of Circle, moving southeast at 25 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Weldon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4755 10600 4776 10602 4790 10578 4778 10534
      4738 10570
TIME...MOT...LOC 0324Z 299DEG 22KT 4770 10585 

HAIL...0.88IN
WIND...70MPH
 
$$

NWS Glasgow / GAH

The office that day

Everything else NWS Glasgow, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 4, 6:29 PM MDTSpecial Weather StatementGGWPhillips46 min
Jun 4, 6:39 PM MDTSevere Thunderstorm WarningGGWPhillips36 min
Jun 4, 7:16 PM MDTSpecial Weather StatementGGWGarfield, Phillips, Valley59 min
Jun 4, 8:09 PM MDTSpecial Weather StatementGGWPhillips36 min
Jun 4, 8:50 PM MDTSpecial Weather StatementGGWGarfield, McCone55 min
Jun 4, 9:34 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Richland56 min
Jun 4, 9:44 PM MDTSpecial Weather StatementGGWDawson, McCone, Prairie, Richland, Wibaux76 min
Jun 4, 10:03 PM MDTSpecial Weather StatementGGWPetroleum42 min
Jun 4, 11:12 PM MDTSpecial Weather StatementGGWDawson, Prairie, Richland, Wibaux63 min
Jun 4, 11:47 PM MDTSpecial Weather StatementGGWPetroleum58 min
Jun 5, 2:55 AM MDTRed Flag WarningGGWDaniels, Phillips, Roosevelt, Sheridan, Valley18 hr
Jun 5, 2:26 PM MDTLake Wind AdvisoryGGWGarfield, McCone, Petroleum, Phillips, Valley28 hr
Jun 5, 4:38 PM MDTSpecial Weather StatementGGWGarfield67 min

Nearby

Severe Thunderstorm Warnings in Montana, 2021Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.